python计数器Count

 1 # python计数器Counter
 2 # 需导入模块collections
 3 import collections
 4 
 5 # 统计各个字符出现的次数，以字典形式返回
 6 obj = collections.Counter(‘adfsdfsdfswrwerwegfhgfhgh‘)
 7 print obj
 8 
 9 # 按参数给定的个数返回
10 print obj.most_common(4)

# 执行结果显示
Counter({‘f‘: 5, ‘d‘: 3, ‘g‘: 3, ‘h‘: 3, ‘s‘: 3, ‘w‘: 3, ‘e‘: 2, ‘r‘: 2, ‘a‘: 1})
[(‘f‘, 5), (‘d‘, 3), (‘g‘, 3), (‘h‘, 3)]